css clearfix (导航效果)

<div style="background-color: #337ab7">
            <div style="float: left">老男孩</div>
            <div style="float: right">图片</div>
        <div style="clear: both">
</div>

.clearfix:after{
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
}